I just wondered because I taught my daughter how to railroad track when she was in 5th grade, the first time she used it in HS her teacher tried to give her a zero because it wasn't the "way it was supposed to be done" Trust me I went off on that and they ended up giving her back the grade she earned. By the way she's been using it 6 years now and has never missed a conversion.
My son is making an attempt at college chemistry. I tried teaching him to railroad track but he can't quite pick it up.
As for those other acronyms, I don't know what they mean as I never used them but railroad tracking is something I use to this day.
Mike